Grinding attachment for sewing-machines



L.N. MCFALL. GRINDING ATTACHMENT FOR SEWING MACHINES.

I APPLICATION FILED IAN.20| |919.

Patented Sept. 20, 1921.-

UNITED STATES i PATENT OFFICE,

Loomis NMCFALL, oF DENVER, coLoRAno. r

GRLNDING ATTACHMENT FOR SEWING-MACHINES.

the city and county of Denver and State of Colorado, have invented certain new and useful Improvements in Grinding Attach- `machine considered in its entirety and of ments for Sewing-Machines; and I do declare the followingto be a full, clear, and j' exact description ofthe invention, such as ,A

will enable others skilled in the art to which it appertains to make anduse the same, reference being had to the accompanying drawings, andk tothe characters of reference marked thereon, which form a part of this specification.

My invention relates to improvements in means adapted to be attached to the flywheel of the sewing machine, whereby grinding of 4various kinds, as may be required in any household, may be accomplished. This attachment includes a frame, preferably of cone-shape, whoselarger extremity or base is detachably connected with the flywheel of the machine, the structure'extending outwardly beyond the fly-wheel and carrying a stem upon which may be secured an emery wheel or other grinding member, the same emery wheel or grinding device being itself readily detachable from the stem, whereby grinding members of different quality may be employed, as circumstances may require.

It is intended to use the grinding attachment when the driving mechanism of the machine is disconnected from the sewing mechanism, or that which operates the needle. In other words, the machine is adjusted so that the sewing mechanismis not operated but the driving structure is still connected to rotate the fly-wheel, as will be readily understood by those familiar with the structure and operation of sewing machines.

I-Iaving briefly outlined my improvement, as well as the function it is intended to perform, I will proceed to describe the same in detail, reference being made to the accompanying drawing, in which is illustrated an embodiment thereof. In this drawing:

Figure 1 is a fragmentary front elevation of a sewing machine, showingmy improvement applied to the fly-wheel, thereof, and in position for use.

Fig. 2 is a horizontal section taken on the line 2 2, in Fig. 1, the parts being shown pn a much larger Scale,

Specification of Letters Patent. Patented Sept, 20, 1921 Application tiled January 20, 1919. Serial No. f71,967.`

Fig. 3 is a perspective, view -of my im-.

proved device detached and with 4theemery wheel or grinding device proper removed.

The same reference characters indicat the same parts in all the views.

Let the numeral 5 designate thel sewing drawing, being Vone embodiment thereof, consists of a hollow, cone-shaped framework, 7, which is provided with a number of springs, 8, which are preferably secured to the inner surface of the hollow cone, as

shown at 9, to which they may be brazed ork soldered, or secured in any other suitable manner. These springs extend beyond the base or larger extremity of the cone and have their extremities bent outwardly, preferably as shown at 10, so that by moving them slightly inwardly they will pass through between the spokes of the flywheel, 6, and when released move outwardly into engagement with the rim of the wheel in such a'manner as to maintain the device securely in place, causing it to rotate with the fly-wheel of the machine. The springs are so disposed as to engage the spokes of the fly-wheel, so that the frame structure `must rotate therewith. One of the springs,

8, is preferably adjustable from the outside of the cone,rbeing equipped with a pair of outwardly projecting loops, 12, which may be pressed inwardly, whereby the spring, 8, is adjusted to facilitate the attachment of the structure to the rim of the wheel. For instance, the other two springs, 8, may be placed in position on the wheel and then, by thrusting the third spring having the parts 12 inwardly and releasing it, the device will be firmly secured to rotate with the wheel. The smaller extremity of the cone is open to receive the head, 13, of a stem, 14, which is secured to the smaller end of the cone in any suitable manner, whereby it is rigidly held in place. The part 13 has a shoulder which is engaged by the emery wheel or grinding member proper, 15, the latter being perforated to fit the stem 14, and being securely held thereon by means of a nut, 16, or in any wheel l5 is readily detachable, as it .may ber other suitable manner, whereby the come necessar to have a ner or coarser Wheel at d1 erent times. Any suitable grinding material may be employed.

' After the grinding member 15 is secured in place and the device attached to the fl wheel of the machine, the latter may e operated to rotate the grinding attachment, in which event any yarticles may be ground or sharpened with great facility, as will be readily understood. Furthermore,by reasonof the fact that the hollow, cone-shaped frame 7 is exteriorly closed, there is no opportunity for accident, as. there would be if theV device were open, since if it were kopen, a person might get his hand caught ing a hollow frusto conical frame vwhose larger .extremity is adapted to lit snugly against the side of the fly Wheel of a sewing machine, means onl the inner'face of said hollow frame at said larger extremity to project between the spokes of said ally, wheel and engage said Vwheel to retain said frame thereon, said means comprising a plurality of elongated U -shaped resilient members having their inner ends secured to the Vinner side of` said frame and theirouter endsnex- Atending beyond said frame, one Vof said U- y'shaped members having an outwardly pro- 'Vjecting portion (12) whereby the memberV may be readily operatedfor the purpose of attaching and releasing the frame from the wheel, an opening in said frame for receivjing said proJection anda grlnding member mounted on the smaller end of said frame.

` In'testimony whereof I aiix my signature.

LOOMIS N.A MCFALL." 

